Conclusion
Despite its weaknesses, Marxism contributes to the theory of international relations in at least four respects. First, historical materialism with its emphasis on production, property relations and class is an important counter-weight to realist theories which assume that the struggle for power and security determines the structure of world politics.
This leads to two further points which are that Marxism has long been centrally concerned with capitalist globalization and international inequalities and that, the global spread of capitalism is the backdrop to development of modern societies and the organization of their the international relations.